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Finding the Fourth Proportional to 106.80, 147.44 and 79.24

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Solution

The fourth proportional to 106.80, 147.44 and 79.24 is: 109.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.80 : 147.44 = 79.24 : x
  2. Step 2: Convert to fraction form
    106.80/147.44 = 79.24/x
  3. Step 3: Cross multiply
    106.80x = 147.44 × 79.24
  4. Step 4: Simplify right side
    106.80x = 11,683.15
  5. Step 5: Solve for x
    x = 11,683.15/106.80
  6. Step 6: Final answer
    x = 109.39

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.